Ziheng Wang

Nonfreeness for rational two-parabolic groups with numerator 24

This preprint presents a proof of nonfreeness for rational two-parabolic matrix groups with numerator 24. For every integer denominator r with |r| > 6, the groups at parameter 24/r are nonfree over both the rational and complex numbers, in SL(2,Q) and SL(2,C). For each such param...